Enantioselective synthesis of (R) and (S)-[9,9′]bi[naphtho(2,1-b)furanyl]-8,8′-diol: a furo-fused BINOL derivative

The enantioselective synthesis of [9,9′]bi[naphtho(2,1-b)furanyl]-8,8′-diol, a modified BINOL, was achieved using an inexpensive route. Both enantiomers of [9,9′]bi[naphtho(2,1-b)furanyl]-8,8′-diol were obtained with satisfactory stereoselectivities by employing two optical antipodes of phenylethylamine as chiral influence in a Cu(II)Cl2 catalyzed oxidative coupling step.